Attachment for looms.



F. F. COWDEN ATTACHMENT FOR LOOMS. APPLICATION HLED NOV-1.30, 1914.

Patented July 18, 1916.

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F. F. COWDEN ATTACHMENT r03 Looms. APPLICATION E lLED NOV-30. I914.

Patented July 18, 19.16.

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FRED F. COWDEN, OF NEW BEDFORD, MASSACHUSETTS.

ATTACHMENT FOR LOOMS.

Specification of Letters Patent.

Patented July 18, 1916.

Application filed November 30, 1914. Serial No. 874,808.

To all whom it may concern Be it known that I, FRED F. CowDEN, a citizenof the United States, and resident of New Bedford, county of Bristol,State of- Massachusetts, have invented certain new and usefulImprovements in Attachments for Looms, of which the following is aspecification.

This invention relates to looms for the production of leno work and hasfor one of its objects the provision of improved means for giving tocertain of the harness frames the required half and return motion at theproper time with reference to the other events of the loom.

A further object is to provide means for this purpose which isadjustable so as to give the proper length of half and return movementand to provide the requisite dwell in the movement.

Other objects and the features of novelty will be apparent from thefollowing description, taken in connection with the accompanyingdrawings, in which:

Figure 1 is a somewhat diagrammatic side elevation of a loom with oneembodiment of my invention applied thereto; Fig. 2 is a skeletonperspective view of the mechanism for giving the half and returnmovement to certain of the harness frames; and Fig. 3 is a section onthe line 3-3 of Fig. 2.

Referring to Fig. 1, 10 indicates the frame of the loom and 11 and 12certain of the harness frames, the frame 11 being shown in the raisedposition and the frame 12 in the lowered position. The frames 11 and 12are given the normal full stroke move' ment by means of the levers 13and 14, these levers being actuated by the usual rocker 15. The crank orlay shaft of the loom is indicated at 16, and the rocker 15, in the loomillustrated, is actuated from the crank shaft 16 by means of the gearingl7 and the con necting rod 18, this arrangement being more fullydescribed in the U. S. Patent No. 488,497, granted to Coldwell. Theparts of the loom so far described, being of well known construction, adetail description thereof is deemed to be unnecessary.

As is well understood by those skilled in the art, it is necessary, inleno weaving, to give a jump or half and return movement I to certain ofthe harness frames independently of the usual full stroke movement. Inthe loom illustrated, the frames 11 and 12 are. actuated by cords orstraps 19 which are connected with loops 20 through which the levers 13and 14 project in the manner fully disclosed in the aforesaid Patent488,497. In order to give the half and return movement to certain of theharness frames, there. is provided on the loom frame a shaft 21 havingone or more quadrants 22 thereon which are connected with the loops 20by means of straps 23. This construction may also be the same as shownand described in Patent No. 488,497, above referred to.

My improvements consist in the mechan sm whereby the shaft 21 is rocked.I provide on some rotating part of the loom, which has two revolutionsfor each full cycle of movements of the rocker 15, an arm 24 whichactuates the shaft 21 through mechanism about to be described. The shaft16 is such a rotating part and I therefore mount the arm 24 on the endof this shaft and in order to permit angular adjustment of the arm aboutthe axis of the shaft, I secure the arm by means of set screws 25. Abracket 26 of any suitable design and supporting a stud 27 is secured onthe frame of the loom. A bell crank lever 28 is pivotally mounted on thestud 27 and the arm 29 of this lever isprovide'd with a longitudinalslot 30 and has secured thereto one end of a link 31. The link 31 ismade adjustable relatively to the arm 29 by providing a pin 32, which isadjustable in the slot 30 and secured in any desired position therein bymeans of a nut 33. The arm 24 is also preferably provided with a slot 34and the link 31 is made adjustable relatively to this arm by aconnection similar to that just described. This connection isillustrated in detail in Fig. 3.

An arm 35 having a longitudinal slot 36 is adjustably secured on theshaft 21 by a set screw 37 and a link 38 has an adjustable connectionwith the arm 35 similar to that shown in Fig. 3, and has its lower endconnected with the arm 39 of the bell crank 28 by a universal joint 40.

The axis of the stud 27 is parallel with the shaft 16 and the shaft 21is arranged at right angles to the shaft 16, so that in order to form anoperative connection between the arm 39 of the bell crank lever and thearm 35 it is necessary to provide some formof universal joint, such asis illustrated at 40.

The operation of the mechanism is as follows: The frames 11' and 12 aregiven their usual full stroke movement by the levers 13 and 14, and therocking of the shaft 21 effects the half and return movement of theframes. By changing the angular position of the arm 24 on the shaft 16,the time of the half and return movement may be varied whollyindependent of the movements of the rocker 15. It will' be understoodthat the arm 24: has a continuous rotating movement which gives anoscillating movement to the bell crank lever 28 and the parts are soadjusted that the link 38 and shaft 21 will have a comparatively longdwell, this being accomplished by arranging the arms 24 and 39 so thatthey pass their dead centers in succession. The degree of rocking of theshaft 21 may be varied by adjusting the different connections of thelinks 31 and 38 and also the amount of dwell may be varied by adjustingthe link 31, because the duration of the dwell will depend largely uponthe angular position of the arm 29 as the arm 24 passes the centers. Inthis way, it is possible to properly time the half and return movementand the duration of the dwell therein, so as to have the desiredflexibility in the operation. This results. in avoiding breakage of thethreads due to insuflicient dwell or improper timing and therefore theproduction of the looms provided with my improvements is greatlyincreased.

Having thus described my invention, what I claim is: i

1. In a loom, the combination of a plurality of harness frames,mechanism for giving to said frames the normal full stroke movementrocker means for actuating cer tain of said frames independently of saidmechanism to give a half stroke movement thereto, a member having tworevolutions to each complete cycle of movements of said mechanism, meansactuated by said member and angularly adjustable relatively theretoabout the axis of rotation, a bell crank lever, link connecting one armof said lever with the last mentioned means to oscillate the lever, andconnections between the other arm of said lever and said rocker means.

.2. In a loom, the combination of a plurality of harness frames,mechanism for giving to said frames the normal full stroke movement,rocker means for actuating certain of sald frames independently of saidmechanism to give a half stroke movement thereto, a member having tworevolutions to each complete cycle of movements of said mechanism, meansactuated by said member and angularly adjustable relatively theretoabout the axis of rotation, a bell crank lever having a fixed fulcrumand a slotted arm, a link connecting the last mentioned means with saidslotted arm and adjustable relatively to the latter, and connectionsbetween the other arm of said lever and said rocker means.

8. In a loom, the combination of plurality of harness frames, mechanismfor giving to said frames the normal full stroke movement, rocker meansfor actuating certain of said frames independently of said mechanism togive a half stroke movement thereto, a member having two revolutions toeach complete cycle of movements of said mechanism, a slotted armcarried by said member and angularly adjustable relatively thereto aboutthe axis of rotation, a bell crank lever having a fixed fulcrum and aslotted arm, a link connecting said arms and adjustable along the slotsthereof, an arm operatively connected with said rocker means, and a linkconnecting the last mentioned arm with the other arm of said bell cranklever.

4. In a loom, the combination of a plurality of harness frames,mechanism for giving to said frames the normal full stroke movement,rocker means for actuating certain of said frames independently of saidmechanism to give a half stroke movement thereto, a member having tworevolutions to each complete cycle of movements of said mechanism, aslotted arm carried by said member and angularly adjustable relativelythereto about the axis of rotation, a bell crank lever having a fixedfulcrum and a slotted arm, a link connecting said arms and adjustablealong the slots thereof, a slotted arm operatively connected with saidrocker means, and a link adjustable along the slot in the last mentionedarm and connected with the other arm of said bell crank lever.

In testimony whereof I affix my signature in presence of two witnesses.

FRED F. COWDEN.

WVitnesses:

CHAs. N. RICHMOND, CHAS. A. DAMON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Iatents, Washington, D. C.

